Primary myocardial revascularization. Trends in surgical mortality

Area of Science:

• Cardiovascular Surgery
• Cardiac Surgery Outcomes
• Medical Technology Advancement

Background:

• Over 24,000 primary isolated myocardial revascularization procedures were performed between 1970 and 1982.
• Surgical techniques and patient profiles evolved during this period, necessitating analysis of outcomes and risk factors.

Purpose of the Study:

• To evaluate trends in operative mortality and identify significant risk factors for myocardial revascularization over a 12-year period.
• To assess the impact of changing patient demographics and surgical practices on cardiac surgery outcomes.

Main Methods:

• Retrospective analysis of 24,672 patients undergoing primary isolated myocardial revascularization, divided into four time-based groups (1970-1982).
• Statistical analysis to determine operative mortality rates and identify independent risk factors for death, including patient demographics, comorbidities, and procedural details.

Main Results:

• Overall operative mortality decreased significantly from 1.2% to 0.8% in the final group (1980-1982).
• Congestive heart failure became the principal risk factor, surpassing emergency operation.
• Factors like left main disease, number of grafts, and poor ventricular function were neutralized as significant risk factors.

Conclusions:

• Morbidity and mortality rates for myocardial revascularization have significantly decreased over time, despite an increase in patient risk factors.
• Cardiac causes of death declined, while neurological deficits and other system failures became more prominent causes of mortality.